Nokia certainly has a new product or two to show us during Mobile World Congress, as it has called a press conference for February 25 at 9am; but what has it got hidden up its sleeve? Apart from the ongoing rumors of a Nokia tablet running Windows RT, there’s also the chance we’re going to be introduced to a few new Lumia Windows Phones.

Three different models have been leaked this week, and although details are limited, it could be our best hint yet at Nokia’s line-up. The first is the Lumia 1000, which has appeared in a menu on China Mobile’s computer system, but sadly in name only. As we’ve only got the name to go on, we’ll have to do some speculating.

The high model number suggests it’s going to be a serious piece of kit, presumably seeing the device taking over the top spot in Nokia’s Windows Phone range from the Lumia 920. The phone believed to be next in line for the throne was previously suspected to be the Nokia Catwalk, so could they be one and the same? If so, it’s unlikely it’ll be released at Mobile World Congress as the Lumia 920 has only been on sale for a few months.

There is, however, another possibility, as the Lumia 1000 could be the phone we currently know as the EOS. If the rumors are correct, the EOS will be the first Windows Phone to have a true PureView camera, and as it would – in a way – replace the 808 PureView in Nokia’s range, an MWC launch is slightly more believable.

Lumia 520 and Lumia 720

Moving on from the Lumia 1000, an anonymous source has tipped MyNokiaBlog about two more Lumia phones – the Lumia 720 and Lumia 520. Judging by the model numbers, we’re looking at a mid-range and an entry level device here. The Lumia 720 sounds good, with a 4.3-inch screen, a dual-core 1GHz processor, 8GB of storage and a 6-megapixel camera/2-megapixel video call lens. As for the Lumia 520, it doesn’t sounds as basic as the model number suggests, as it has a 4-inch screen (which is labelled as Super Sensitive), a dual-core 1GHz chip, 8GB of storage and a 5-megapixel camera.

Nokia already makes a Lumia 620, which has a 3.8-inch screen, a 5-megapixel camera and a dual-core 1GHz processor, while the Lumia 505 runs Windows Phone 7.8. A model in-between makes sense, but the 4-inch screen doesn’t sound quite right given the 620’s spec. Also, a 6-megapixel camera is almost unheard of on the smartphone scene, making us a little skeptical about the Lumia 720’s spec sheet. That said, two phones sharing the same model numbers have been approved for use by the Indonesian communication’s regulator, lending them an air of credibility, even if it is in name alone.

The answers to all our Nokia-related questions will come on February 25 at Mobile World Congress.